diff --git a/biz/docker/stack.go b/biz/docker/stack.go
index efc5f92..cab02ee 100644
--- a/biz/docker/stack.go
+++ b/biz/docker/stack.go
@@ -299,12 +299,12 @@ func createConfigs(ctx context.Context, cli *client.Client, configs []swarm.Conf
 		case err == nil:
 			// config already exists, then we update that
 			if err = cli.ConfigUpdate(ctx, config.ID, config.Meta.Version, configSpec); err != nil {
-				errors.Wrap(err, "failed to update config "+configSpec.Name)
+				return errors.Wrap(err, "failed to update config "+configSpec.Name)
 			}
 		case client.IsErrNotFound(err):
 			// config does not exist, then we create a new one.
 			if _, err = cli.ConfigCreate(ctx, configSpec); err != nil {
-				errors.Wrap(err, "failed to create config "+configSpec.Name)
+				return errors.Wrap(err, "failed to create config "+configSpec.Name)
 			}
 		default:
 			return err
diff --git a/biz/event.go b/biz/event.go
index 34af456..872bfc6 100644
--- a/biz/event.go
+++ b/biz/event.go
@@ -26,7 +26,6 @@ func (b *eventBiz) Create(event *model.Event) {
 			log.Get("event").Errorf("Create event `%+v` failed: %v", event, err)
 		}
 	})
-	return
 }
 
 func (b *eventBiz) CreateRegistry(action model.EventAction, id, name string, user web.User) {
diff --git a/biz/stack.go b/biz/stack.go
index 7675e4a..3bcbbb8 100644
--- a/biz/stack.go
+++ b/biz/stack.go
@@ -124,5 +124,4 @@ func (b *stackBiz) Migrate() {
 	do(func(d dao.Interface) {
 		d.StackMigrate()
 	})
-	return
 }
diff --git a/dao/bolt/bolt.go b/dao/bolt/bolt.go
index 3b258b5..a671182 100644
--- a/dao/bolt/bolt.go
+++ b/dao/bolt/bolt.go
@@ -1,7 +1,6 @@
 package bolt
 
 import (
-	"encoding/binary"
 	"encoding/json"
 	"path/filepath"
 	"strings"
@@ -145,8 +144,8 @@ func matchAny(s string, list ...string) bool {
 }
 
 // itob returns an 8-byte big endian representation of v.
-func itob(i uint64) []byte {
-	b := make([]byte, 8)
-	binary.BigEndian.PutUint64(b, i)
-	return b
-}
+//func itob(i uint64) []byte {
+//	b := make([]byte, 8)
+//	binary.BigEndian.PutUint64(b, i)
+//	return b
+//}
diff --git a/dao/mongo/chart.go b/dao/mongo/chart.go
index 4e4d671..0d79a2d 100644
--- a/dao/mongo/chart.go
+++ b/dao/mongo/chart.go
@@ -39,7 +39,6 @@ func (d *Dao) ChartBatch(names ...string) (charts []*model.Chart, err error) {
 		q := bson.M{"_id": bson.M{"$in": names}}
 		charts = make([]*model.Chart, 0)
 		err = db.C("chart").Find(q).All(&charts)
-		return
 	})
 	return
 }
diff --git a/scaler/scaler.go b/scaler/scaler.go
index 7ee70f2..1abd079 100644
--- a/scaler/scaler.go
+++ b/scaler/scaler.go
@@ -101,16 +101,23 @@ func tryScale(service *swarm.Service, opts data.Options) {
 		return
 	}
 
+	logger := log.Get("scaler")
 	replicas := *service.Spec.Mode.Replicated.Replicas
 	if result.Type == scaleUp {
 		if replicas < max {
-			docker.ServiceScale(service.Spec.Name, service.Version.Index, replicas+step)
-			log.Get("scaler").Infof("scaler > Service '%s' scaled up for: %v", service.Spec.Name, result.Reasons)
+			if err := docker.ServiceScale(service.Spec.Name, service.Version.Index, replicas+step); err != nil {
+				logger.Errorf("scaler > Failed to scale service '%s': %v", service.Spec.Name, err)
+			} else {
+				logger.Infof("scaler > Service '%s' scaled up for: %v", service.Spec.Name, result.Reasons)
+			}
 		}
 	} else if result.Type == scaleDown {
 		if replicas > min {
-			docker.ServiceScale(service.Spec.Name, service.Version.Index, replicas-step)
-			log.Get("scaler").Infof("scaler > Service '%s' scaled down for: %v", service.Spec.Name, result.Reasons)
+			if err := docker.ServiceScale(service.Spec.Name, service.Version.Index, replicas-step); err != nil {
+				logger.Errorf("scaler > Failed to scale service '%s': %v", service.Spec.Name, err)
+			} else {
+				logger.Infof("scaler > Service '%s' scaled down for: %v", service.Spec.Name, result.Reasons)
+			}
 		}
 	}
 }